Experimental and numerical investigation of strip rolling from dual phase steel

The paper focuses on hot rolled and fast cooled dual phase (DP) steel strips for automotive application. The analysis carried out in this work includes many tests and experiments such as: dilatometric and plastometric tests, Gleeble simulations of hot rolling process, simulation of strip cooling after rolling and hot rolling of DP steel samples in laboratory conditions. The main part of the paper contains the results of experimental rolling of DP steel samples in laboratory conditions. Especially, the influence of cooling rate on phase volume fraction and some mechanical properties of DP strips have been analysed. The realized hot rolling with controlled cooling of DP samples in laboratory conditions allowed for obtaining diversified steel microstructure and thus wide range of mechanical properties. The results of the analysis carried out in this work provide the useful data for the designing of thermo-mechanical rolling of DP steel strips.